Long Twilights

I read in the newspaper today that we are not only in a period of long days and short nights but also in a period of long twilights, which occur around the summer solstice.

I learned in this article that there is something called "astronomical twilight," which only ends when the last glint of light leaves the sky. Last night that was 10:33 p.m. And this morning the light was back at it by 3:43 a.m.

Most of us can't discern such minute shadings of gray. But they are there. And they are longer now than at any other time of year.